anonymous
  • anonymous
Use the Quadratic Formula to solve the equation. 2x^2 -7x-5=0
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
pooja195
  • pooja195
Start by listing your abc values
AlexandervonHumboldt2
  • AlexandervonHumboldt2
ax^2+bx+c=0
AlexandervonHumboldt2
  • AlexandervonHumboldt2
formula is: \[\frac{ -b \pm \sqrt{b^2-4ac} }{ 2a }\]

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More answers

anonymous
  • anonymous
a=2 b=7 c=5
AlexandervonHumboldt2
  • AlexandervonHumboldt2
b and c have wrong sign
anonymous
  • anonymous
b=-7 c=-5 ?
mathmale
  • mathmale
good.
AlexandervonHumboldt2
  • AlexandervonHumboldt2
yes now substitute all this into the formula
mathmale
  • mathmale
\[y=\frac{ -b \pm \sqrt{b^2-4ac} }{ 2a }\]
mathmale
  • mathmale
Note that this produces two results (roots).
anonymous
  • anonymous
|dw:1450325725665:dw|
AlexandervonHumboldt2
  • AlexandervonHumboldt2
wrong
SolomonZelman
  • SolomonZelman
|dw:1450326173819:dw|
SolomonZelman
  • SolomonZelman
|dw:1450326199948:dw|
anonymous
  • anonymous
Yes that was a mistake
AlexandervonHumboldt2
  • AlexandervonHumboldt2
also where did |dw:1450301293190:dw|
anonymous
  • anonymous
answer |dw:1450326333951:dw|
anonymous
  • anonymous
@mathmale
mathmale
  • mathmale
Please give me a moment.
mathmale
  • mathmale
a=2, b=-7, c=-5. \[y=\frac{ -b \pm \sqrt{b^2-4ac} }{ 2a }\]
mathmale
  • mathmale
It profit you more to finish this yourself and to share your work and your answer with me. would you please do that?
mathmale
  • mathmale
Excuse me, "It would profit you more."
Smartyprincess
  • Smartyprincess
Solution: 2x2+7x−15=0 2x2+7x−15=0/:2 x2+72x−152=0 Step1: Divide all terms by the coefficient of x2. x2+72x=152 Step 2: Keep all terms containing x on one side. Move the constant to the right. x2+72x+(74)2=152+(74)2 Step 3: Take half of the x-term coefficient and square it. Add this value to both sides. x2+72x+(74)2=16916 Step 4: Simplify right side. (x+74)2=16916 Step 5: Write the perfect square on the left. x+74=±16916−−−−√ x+74=±134 Step 6: Take the square root on both sides of the equation. x1=−74+134=32 x2=−74−134=−5 Step 7: Solve for x.
Smartyprincess
  • Smartyprincess
ok, :)
mathmale
  • mathmale
Nevermind. I did the calculations myself and see that your result is just fine, Alijah.
Smartyprincess
  • Smartyprincess
me?
mathmale
  • mathmale
Thanks for your input, but I'm talking to Alijah.
Smartyprincess
  • Smartyprincess
ok
Smartyprincess
  • Smartyprincess
welcome :)
anonymous
  • anonymous
@mathmale so i am correct?
mathmale
  • mathmale
Yes, you are correct. I'm putting them into slightly different form, but that doesn't mean yours was wrong.
mathmale
  • mathmale
\[y=\frac{ 7+\sqrt{89} }{ 4 }\]
mathmale
  • mathmale
and the same, with a negative sign after the 7.
anonymous
  • anonymous
thanks again.
mathmale
  • mathmale
|dw:1450327231270:dw|
mathmale
  • mathmale
You're welcome. Thanks for your perseverance.

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